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1 <br />' 30 March 2005 <br /> AGE-NC Project No 95-0130 <br />' Page 5 of 13 <br />' 3.0. INTERIM SOIL VAPOR EXTRACTION REMEDIATION <br /> Between 01 October and 22 December 2004,an SVE remediation system was continuously operated <br /> at the site, utilizing an electric catalytic oxidizer SVE system to apply an induced vacuum to well <br /> VW-I (A and B) SVE procedures for the site were described in the AGE-prepared Interim <br /> Remediation Work Plan, dated 21 May 2003, and approved by the SJCEHD by letter dated 10 June <br /> 2003 <br />' 3 1 REMEDIATION SYSTEM PROCEDURES <br /> The SVE system utilized a manifold network of two-inch diameter, Schedule 40 PVC piping <br /> installed underground from SVE wells VW-1 through VW-3 to the inlet of the SVE remediation <br /> system The SVE remediation system consists of a Solleco Ecat 250 catalytic oxidizer vapor <br />' recovery system <br /> In order to monitor efficiency of the SVE system, 1)a Magnehelic vacuum gauge and Dwyer DS-200 <br /> differential pressure sensor was installed prior to the inlet of the SVE unit so that air flow rate is <br /> monitored, the flow rate was determined from the measured differential pressure and the piping <br /> diameter using a nomograph(Appendix B),2)SVE air flow of the influent and effluent streams were <br /> monitored routinely for the presence of organic vapor using an organic vapor analyzer (OVA) <br /> equipped with a photo-ionization detector(PID Thermo Environmental 580B, 10 0 eV, calibrated <br /> to isobutylene), and 3) influent and effluent air flow vapor stream samples were collected from <br /> sampling ports installed upstream(influent)of the vacuum blower and downstream(effluent)of the <br /> catalytic oxidizer and submitted for laboratory analysis Field measurements were recorded at regular <br /> intervals and are summarized in Table 6 <br /> Between 01 October and 22 December 2004,an induced vacuum was continuously applied to SVE <br /> well VW-I (A and B) to extract hydrocarbon vapor from the subsurface, SVE wells VW-213 and <br /> VW-3B were each closed at the well-head due to the intense petroleum hydrocarbon vapor <br /> encountered when extracting from all three wells (Table 6) <br /> 3 2 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> A total of five sets of extracted air flow vapor samples were collected on 01 October, 12 October, <br /> 18 October, 23 November and 22 December 2004 from the influent and effluent of the catalytic <br /> oxidizer vapor recovery system to measure concentrations of hydrocarbon vapor The samples were <br /> collected in Tedlar bags utilizing an electric air-vacuum pump <br /> Advanced CeoEnviroomental,Inc <br /> I <br />